(1) An electric heater carries a current of 13.5 A when operating at a voltage of 1.20 x 10^2 V. What is the resistance of the heater?
(2) The temperature difference between the inside and the outside of a home on a cold winter day is 57 *F. Express this difference on (a) the Celsius scale and (b) the Kelvin scale.
(3) The two mirrors meet at a right angle. The beam of light in the vertical plane P strikes mirror 1 (variables: 40.0* and 1.25 m). (a) Determine the distance (in m) the reflected light beam travels before striking mirror 2. (b) In what direction (with respect to a line normal to mirror 2) does the light beam travel after being reflected from mirror 2?
1
Expert's answer
2020-02-10T09:25:37-0500
1)
"R=\\frac{U}{I}=\\frac{120}{13.5}=8.89\\Omega"
2) a)
"\\Delta T=57\\frac{5}{9}=31.67\\degree C"
b)
"\\Delta T=57\\frac{5}{9}=31.67\\ K"
3)
a)
"d\\sin{40}=1.25"
"d=1.94\\ m"
b) The direction of light will be opposite to the initial direction.
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